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We have had this question come up a lot lately (what is the best roof sealer for RV's) and I have to say I agree! We have sold quite a bit of Gaco Roof for RVs and it is a fantastic product. A gallon of GacoRoof will cover 100 square feet, and it's best to do 2 coats, so figure one gallon for every 50 square feet of surface you want to cover.

The coating is very reflective, so it has the added benefit of keeping interiors cooler while keeping them dry.

Is this just for the flat surfaces or can it be used for joints and seam openings like where the skylights come through the roof?

I just purchased a 1989 Winnebago that has a uncoated aluminum roof and I want to protect the aluminum and seal the joint between the flat aluminum and the fiberglass crown between the roof and the walls.

Peter, depending on the application consider also eternabond. proven rv product been around a long time. go to youtube.com and search for their videos. NEVER use any household roof sealers from Home Depot, etc.

I'm used to dealing with sailboats - keeping water out - and keeping things sealed against lots of exposure to the elements...

I agree silicone will fail in most circumstances on exterior applications- that said - although marine products usually aren't budget friendly - 3m 4200 sealant for something you'd like to get off again someday - or 3M 5200 sealant if you want it sealed permanently and whatever you may be attaching will also be almost permanent. You can also fill cracks and voids with epoxy resins and filler mixed in.

I have to recoat my EPDM this season using GacoRoof, I called Gaco and the Representive said I probably would not have to prime the roof Gaco roof primer, would anyone who has GacoRoof let me know if primed or did not pime.

We sell a lot of GacoRoof to RV'ers and as Robert mentioned usually it doesn't require priming. But the manufacturer does say that some aged EPDM requires the use of their primer. If in doubt you can get a GacoRoof Adhesion Test Kit and test it out yourself. The test kit is free; you just pay the cost of FedEx shipping.

Basically you paint a stripe of the coating, stick the strip of tape into it while it's still wet, let it dry, then pull up the tape. If the coating under the tape sticks to the roof, you have good adhesion. If all the coating pulls up with the tape, you might need the primer.

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